Electric reciprocating hand tool



y L. F. LRjl-ERv 2,087,018

ELECTRIC RECIPOC'ATINQ HAND ToorJ Filed April 27. 1936 WWA wm; K 0

[fa/wf@ @werf/P ATTORNEY.

INVENTOR.

is; lea-ft l 2,087,018 ELECTRIC RECIPROCATING HAND TOOL Leonard F.Carter, Colorado Springs, Colo. Application April 27, 1936, Serial No.76,628

1 Claim. (Cl. 143-68) f This invention relates to a reciprocating atterwhich lits into a socket in a reciprocating tachment for use on theextremity of a flexible member I9. A tool stud projects forward shaftfor operating any reciprocating tool such from the inner extremity of areciprocating memas a saw blade or the like. berv I9. yThe rearwardextremity of a member IS 5 The principal object of the invention is toprois contured so as to form a cam surface 2|. vide a' small compactdevice which can be easily This cam surface rises for approximately 270,brought to the work and held in the hand and' thence descends to itsoriginal starting point in moved to follow any desired cutting lines incutabout 90; The cam surface 2I is lconstantly ting or forming anydesired material. The invenpressed against a roller stud 22 on thedriving l0 tion can be used for cutting `out grill and scroll member I3,by means of a compression spring 23, 10 work from sheet material or canbe used for cutand the member I9 is prevented from retelling `ting orworking metal in difflcultly accessible by means ofa key pin 24 whichprojects into a places in machine shops and assembling plants,longitudinally extending slot 25 in the housing I0. Another object ofthe invention is to provide .While the invention is particularlydesigned for l5 means for attaching a saw or other cutting blade holdinge SeW blade, it iS conceivable 0f COUISe 15 i to the device so that ltwill be securely clamped that it Could be used t0 hold any tool WhoseOperainto position from a single end thereof. tion requires eleepleeating motion eS for' nother objects and advantages reside in thede- Stance, a Chisel, routing tool. file, abrasive blade. tailconstruction of the invention, which is deete. AS illustrated, it iSholding a Sew blade 26- uN-rrltdsmits OFFICE* signed for simplicity,economy, and efflciencv The saw blade is fitted into a slot 21 in the 20120 These will become more apparent from the followextremity ef "themember 20. The tWO Sides 0f ing description. the slot are clampedagainst the saw blade by in the following detailed description of themeans of a clamping cap 28 which, as it is invention reference ishad tothe accompanying 'threaded Onto the member 20, travels against a drawingwhich forms a, part hereof. Like nu.. beveled surface 29 thereon to iiexthe biiurcated 25 2 merels refer to like parts in all views of thedrawextremity and close the slot 21. T0 more Securely lng and throughoutthe description. hold-the saw in position, two locking pins 30 are Inthe drawing: provided. Each of these pins is secured in one Fig. 1 is aside elevation 0f the Complete e001, of the furcations of thestud 20,and slides within illustrating it attached to the extremity of a suittheother furcation. The extremity of the saw is 3o 30. able exible shaft,notched as indicated at 3|, in Fig. 6 so that Fig. 2. is e longitudinalsection Athereof in the it may be passed over the rst pin 30 and under`retractedposition. the second pin 30 before the cap 28 is tightenedFig. 3 is a similar section in the extended posiinto Positiontion. Itcan be readily seen that as the iiexible shaft 35 ig 41s a, detail view0f the inner extremity of` I5 rotates the rotating member I3, the actionof the reciprocating member. the roller stud 22 against the cam face ZIwill Fig. 5 is a. detail view of the tool engaging force the member I9forwardly, then allow it to extremity of the reciprocating member,return under the action of the spring 23, causing Fig, 6 illustrates atypical saw blade of the type a rapid reeiprocation of the blade 26. Theblade 40 intended for use ln the invention, will make one completeforward and backward `The invention comprises a tubular shell mreciprocation and each revolution of the member `closed at its rearwardextremity by a *rear I3.' The rearward thrust on the member I3octhreaded cap Illand at its forward extremity by a v casmned by thespring 23 is absorbed in Suitable front threaded cap l2. Within thetubular shaft ha bimngs 32 45 IIJ is a rotary driving member I3 havingan ex-` Whne a.specic form of the .improvement has tending shaft Stud lfor attachment to the ex been described and illustrated herein,t isdesired i tremiti7 of a suitable flexible shaft I5. `The shea/th mtg?uerstood h the Sarledm'yi be v-lrlled for the flexible shaft indicatedat I6 is threaded g1 nii efscopeu e appen e c a m' W1 out 5() one athreaded nipple n on the e H .so eivi ti dect tlithat is as to preventthe housing I0 from rotatingV with Claimed arid desired secured byLetters patent the shaftl'ti. isz- The dllVlng member `iS DI'OVlded Withe f01- A hand tool reciprocating device comprising: i Wetdly extendingextremlty I8 Of redlleed dlemet a tubular housing; a driving memberrotatably 55 housing and providing a. bearing for the reduced rearwardextremity on said driving member; a

thrust bearing between said driving member and said rear cap; a frontcap closing the forward extremity of said housing and providing abearing for said shaft; a stud projecting from the reduced forwardextremity of said driving member; a compression spring interposedbetween said front cap and said hollow sleeve acting to maintain thecontoured rear edge thereof against said stud; means for attaching atool to the forward extremity of said shaft; means for attaching aflexible shaft housing to said rear cap; and means for attaching aflexible shaft to the reduced rearward extremity of said driving member.

LEONARD F. CARTER.

